fix(text_prompt): use unicode-width instead of char cnt

[kxxt]

The cursor position is not correct when there are emojis in the prompt(See the picture below). This PR fixes it by using unicode-width.

[joshka]

LGTM

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[kxxt]

LGTM

Hi, @joshka on a second thought I think there's no need to depend on unicode-width at all. Line exposes a width method already so there's no need to convert it to a string to measure its width. I am currently away from my computer. Maybe you can fix it directly since this PR is already merged. And because this bug impacts my application, I would appreciate a new release/prerelease of tui-prompts. Thanks in advance!

[kxxt]

LGTM

Hi, @joshka on a second thought I think there's no need to depend on unicode-width at all. Line exposes a width method already so there's no need to convert it to a string to measure its width. I am currently away from my computer. Maybe you can fix it directly since this PR is already merged. And because this bug impacts my application, I would appreciate a new release/prerelease of tui-prompts. Thanks in advance!

#48

[joshka]

I'll release shortly. Thanks for the prs